JP2015125372A - Optical modulator module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily maintain an electrical connection between an optical modulator and a control part of an LGA package.SOLUTION: A socket 102 houses and fixes a reflection type display element 101 in a state that the reflection type display element 101 is electrically connected. A circuit board 104 is disposed behind the socket 102, and has a land 104a which is electrically connected to a second contact 102g of the socket 102. A base plate 106 is disposed behind the circuit board 104, and holds the socket 102 and the circuit board 104. A cushioning material 105 is disposed between the base plate 106 and the circuit board 104.

Description

  The present invention relates to an optical modulator module in which an optical modulator having an LGA (Land Grid Array) package structure is modularized with a circuit board.

  Conventionally, an optical modulator such as an LGA package DMD (registered trademark: Digital Micromirror Device) has a concave case portion, a plurality of modulator-side contacts two-dimensionally arranged on the concave bottom surface of the case portion, and a case portion. Is attached to a socket having a control-side contact provided on the back surface of the socket. Then, in the socket, the base member is pressed from the back side (the side not in contact with the socket) of the circuit board in a state where the control side contact is pressed against the land part of the circuit board connected to the control unit. A plurality of through holes are formed in the base member, and a shaft portion of a bolt is inserted into the through hole, and is fixed to the case body by the bolt.

JP 2006-127804 A

  However, since the optical modulator module is firmly fixed to the case body with bolts, when the case body is thermally deformed by heat generated depending on the usage state of the display device, a minute gap is formed between the circuit board and the socket. There is a possibility of affecting the contact between the land portion of the circuit board and the control side contact of the socket.

  Also, if there is a variation in dimensional error between the mounting surface of the case body and the contact surface of the circuit board, the contact between the land part of the circuit board and the control side contact of the socket will be affected by the bolt tightening stress. There was a risk of giving.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical modulator module capable of maintaining good electrical connection between an optical modulator of an LGA package and a control unit.

  In order to achieve the above object, a reflective display module according to the present invention includes a reflective display element, a socket having an electrode on the back side, which is housed and fixed in a state where the reflective display element is electrically connected, A mounting plate for holding the socket from the surface side; a circuit board disposed behind the socket and electrically connected to the electrode of the socket; and a base plate disposed behind the circuit board; And a cushioning material disposed between the base plate and the circuit board.

  ADVANTAGE OF THE INVENTION According to this invention, the optical modulator module which can maintain the electrical connection of the optical modulator of a LGA package and a control part favorably can be provided.

It is a figure explaining the structure of the display apparatus in embodiment of this invention. It is a schematic sectional drawing of the reflection type display module in the said embodiment.

  Hereinafter, an optical modulation module according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a display device 1 to which a reflective display module (light modulation module) 100 according to the present embodiment is attached. As shown in FIG. 1, such a display device 1 includes a light source 10 that emits illumination light K, and an image light L that represents the display image M generated by the reflective display module 100 by taking the illumination light K from the light source 10. Is directed toward the plane mirror 30, the plane mirror 30 that reflects the image light L emitted from the relay optical unit 20 to the back of the transmissive screen 40, and the image light L reflected by the plane mirror 30 on the back , And the light source 10, the relay optical unit 20, the plane mirror 30, the transmissive screen 40, and the reflective display module 100 are housed inside and partially And a housing 50 having a transmission part 50a that transmits the display image M displayed on the transmission screen 40 to the outside. In addition, the display device 1 includes a control unit (not shown) inside or outside the housing 50, and the control unit is connected to the light source 10 and the reflective display module 100 with a wiring (not shown). The control unit controls the light intensity and timing of the illumination light K emitted from the light source 10, and controls the reflective display module 100 (reflective display element 101) to display a desired display image M. is there.

  The light source 10 includes, for example, a plurality of LEDs that can output red, blue, and green light, respectively, and emits illumination light K with a desired color, light intensity, and timing under the control of the control unit. Further, the display device 1 according to the present embodiment employs a field sequential color driving method, and each color LED of the light source 10 emits illumination light K in a time-division manner.

  The relay optical unit 20 includes a mirror unit 21, a prism 22, a projection lens 23, and a case body 24 that houses them.

  The mirror unit 21 is a glass base material coated with a thin film having a characteristic of reflecting red, green, and blue illumination light K, and the reflective display module 100 reflects the illumination light K from the light source 10 by reflection. Is incident at an appropriate angle. The prism 22 transmits the illumination light K reflected by the mirror unit 21 and irradiates the light modulator 101 described later. The image light L generated by the light modulator 101 is reflected toward the projection lens 23 by the inclined surface of the prism 22. The projection lens 23 enlarges the image light L and projects it onto the plane mirror 30.

  The plane mirror 30 is formed by forming a reflective film on the surface of a base material made of, for example, a synthetic resin material by means such as vapor deposition, and the image light L of the display image M emitted from the light modulator 101 is transmitted to the transmissive screen 40. Reflected toward

  The transmissive screen 40 receives the image light L from the plane mirror 30 on the back surface and transmits it, thereby displaying the display image M on the surface side. For example, a holographic diffuser, a microlens array, a diffusion plate, etc. Consists of. The display image M displayed on the surface of the transmission screen 40 is transmitted from the transmission part 50 a of the housing 50.

  The configuration of the reflective display module 100 and a method for attaching the reflective display module 100 to the case body 24 will be described with reference to FIG. FIG. 2 is a cross-sectional view of the reflective display module 100 attached to the case body 24. The reflective display module 100 includes a reflective display element (light modulator) 101, a socket 102, a mounting plate 103, a circuit board 104, a cushion material 105, a base plate 106, and a set screw 107. The reflective display module 100 that is provided and assembled is fixed to the case body 24 by the mounting screw 200.

  The reflective display element (light modulator) 101 is, for example, a reflective display device such as DMD or LCOS (registered trademark: Liquid Crystal On Silicon), and a plurality of lands 101a are two-dimensionally arranged on the back side of the reflective surface. The plurality of lands 101a are housed and fixed in the socket 102 so as to be electrically connected to first contacts 102d of the socket 102 described later. The plurality of lands 101a are arranged in a region excluding the central region of the reflective display element 101, and a rectangular heat dissipating land 101b is disposed in the central region in order to release the heat of the reflective display device 101. The

The socket 102 is formed in a concave shape so that the reflective display element 101 can be accommodated in a substantially central portion by an insulating resin, and the concave bottom surface 102a is a flat surface having a rectangular opening 102b in the central region. It has become. A plurality of first holes 102c are formed on the bottom surface 102a so as to surround the opening 102b, and the conductive first contacts 102d are accommodated in the plurality of first holes 102c so as to protrude somewhat. Has been. Further, a plurality of second holes 102f are formed on the back surface 102e of the socket 102 so as to surround the opening 102b. The plurality of second holes 102f are respectively connected to the plurality of first contacts 102d. A plurality of electrically connected second contacts 102g are accommodated so as to protrude somewhat. The first contacts 102d are in contact with the lands 101a of the LGA package of the reflective display element 101, and a plurality of second contacts 102g electrically connected to the first contacts 102d are in contact with the lands 104a of the circuit board 104. To do.
The socket 102 has a protrusion 102h, and the protrusion 102h is inserted into an attachment hole 103b of the attachment plate 103, which will be described later, so that the socket 102 containing the reflective display element 101 is positioned on the attachment plate 103. The

  The mounting plate 103 includes a display hole 103a through which the illumination light K incident on the reflective display element 101 and the image light L reflected by the reflective display element 101 pass, and a protrusion insertion hole 103b into which the protrusion 102h of the socket 102 is inserted. And a projection 103d for positioning a circuit board 104, a cushion material 105, and a base plate 106, which will be described later, and the reflective display module 100 is attached to the case body 24. It is a member that comes into contact with the case body 24 when it hits.

  The circuit board 104 is formed of a hard base material, and a plurality of lands 104a are formed so as to contact the plurality of second contacts 102g of the socket 102, and a rectangular opening 104b is formed in the central region. Further, a positioning hole 104c into which the protrusion 103d of the mounting plate 103 is inserted is formed. The circuit board 104 is connected to the control unit by a wiring (not shown), and supplies an electric signal and power from the control unit to the reflective display element 101 via the land 104a. The circuit board 104 is held by fixing a base plate 106 to be described later to the mounting plate 103.

  The cushion material 105 is made of, for example, an elastic member such as urethane, and is formed in a shape that covers a contact area where the second contact 102g of the socket 102 and the land 104a of the circuit board 104 are in contact with each other. An opening 105a and a positioning hole 105b into which the protrusion 103d of the mounting plate 103 is inserted are formed. The cushion material 105 is disposed between the circuit board 104 and a base plate 106 to be described later. When the base plate 106 is screwed to the mounting plate 103 with a set screw 107, the cushion material 105 and the circuit board 104 are described later. The circuit board 104 is pressed against the socket 102 (second contact 102g) side by an elastic force that is compressed between the base plate 106 and returns to the original shape. With such a configuration, the contact between the land 104a of the circuit board 104 and the second contact 102g of the socket 102 can always be kept good.

  The base plate 106 is a hard plate-like member disposed on the back side of the cushion material 105, and has a rectangular opening 106a and a positioning hole 106b into which the projection 103d of the mounting plate 103 is inserted in the central region. A through hole 106c through which a later-described holding screw 107 is inserted, a protrusion 103d of the mounting plate 103 is inserted into the positioning hole 106b, and a later-described holding screw 107 is inserted into the through hole 106c. The socket 102, the circuit board 104, and the cushion material 105 in which the reflective display element 101 is housed can be pressed and fixed to the mounting plate 103 side.

Hereinafter, a method for assembling the reflective display module 100 in the present embodiment will be briefly described.
(1) The reflective display element 101 is housed and fixed in the socket 102, and the socket 102 is fixed to the mounting plate 103. (2) The protrusion 103 d of the mounting plate 103 is inserted into the positioning hole 104 c of the circuit board 104, the positioning hole 105 b of the cushion material 105, and the positioning hole 106 b of the base plate 106 on the back side of the socket 102. (3) Screw onto the mounting plate 103 from the back side of the base plate 106 using a set screw 107. Thereby, the reflective display module 100 is assembled. Further, the reflective display module 100 is fixed to the case body 24 by inserting the mounting screw 200 into the through hole 103 c provided in the mounting plate 103 of the reflective display module 100 and screwing the mounting screw 200 to the case body 24. Can do.

  As described above, the reflective display module 100 according to the present embodiment includes the reflective display element 101, the socket 102 for storing and fixing the reflective display element 101 in an electrically connected state, and the socket 102. A mounting plate 103 held from the front side, a circuit board 104 having a land 104a disposed behind the socket 102 and electrically connected to the second contact 102g of the socket 102, and disposed behind the circuit board 104; When the base plate 106 is attached, the base plate 106 includes the base plate 106 that sandwiches the socket 102 and the circuit board 104 and the cushioning material 105 that is disposed between the base plate 106 and the circuit board 104. 106 presses the circuit board 104 uniformly against the socket 102 via the cushion material 105. Therefore, the contact between the land 104a of the circuit board 104 and the second contact 102g of the socket 102 can always be kept good, and even when the case body 24 is slightly deformed, the circuit board 104 can be maintained. And the electrical connection between the socket 102 and the socket 102 can be maintained well. Further, since the cushion material 105 is disposed so as to cover a region where the second contact 102g of the socket 102 and the land 104a of the circuit board 104 are in contact with each other, the electrical connection between the circuit board 104 and the socket 102 is good. Can be maintained.

In the above-described embodiment, the socket 102, the circuit board 104, and the cushion material 105 are sandwiched between the mounting plate 103 disposed on the front surface side and the base plate 106 disposed on the back surface side, but the present invention is not limited thereto. Instead, the mounting plate 103 may be omitted, and the socket 102, the circuit board 104, and the cushion material 105 may be sandwiched between the case body 24 disposed on the front surface side and the base plate 106 disposed on the back surface side.

In the above embodiment, as the means for pressing and fixing the base plate 106 to the circuit board 104 side, screwing by the holding screw 107 is used, but various known engaging means such as hooking can be applied. Out material 1052g00,

DESCRIPTION OF SYMBOLS 1 Display apparatus 10 Light source 20 Relay optical unit 21 Mirror part 22 Prism 23 Projection lens 24 Case body 30 Plane mirror 40 Transmission type screen 50 Case 100 Reflective display module (light modulator module)
101 Reflective display element (light modulator)
102 Socket 103 Mounting plate 104 Circuit board 105 Cushion material 106 Base plate 107 Set screw 200 Mounting screw

Claims (2)

An optical modulator;
The optical modulator is stored and fixed in an electrically connected state, and a socket having an electrode on the back side;
A mounting plate for holding the socket from the surface side;
A circuit board having a land disposed behind the socket and electrically connected to the electrode of the socket;
A base plate disposed behind the circuit board;
A cushioning material disposed between the base plate and the circuit board,
An optical modulator module. The cushion material is disposed so as to cover a contact area where the electrode of the socket and the land of the circuit board are in contact with each other.
The optical modulator module according to claim 1.

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